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Table 2 The PSNR of denoising for images of different methods

From: The UDWT image denoising method based on the PDE model of a convexity-preserving diffusion function

Image Noise variance PSNR (dB) Proposed
Noisy image UDWT threshold LLT Y-K Ref .[22]
Elaine 20 22.13 29.61 29.84 29.64 30.15 30.22
30 18.62 28.67 28.15 28.01 28.94 29.34
40 16.11 27.77 27.21 25.86 28.2 28.35
50 14.13 27.09 24.54 23.86 27.18 27.28
60 12.57 26.63 23.11 21.52 27.23 26.71
Tank 20 22.11 28.47 28.24 28.97 27.42 29.37
30 18.57 27.93 27.23 28.41 26.18 28.64
40 16.09 27.48 24.95 27.18 25.62 27.86
50 14.13 26.85 22.57 25.52 24.88 26.96
60 12.58 25.98 20.31 23.35 24.12 26.17
Sea 20 22.09 28.19 27.72 27.87 29.25 28.29
30 18.61 27.63 27.01 27.48 27.77 27.79
40 16.09 26.82 24.93 25.56 26.86 27.06
50 14.16 26.18 22.62 23.63 26.14 26.31
60 12.59 25.34 20.36 21.69 25.39 25.46
Plane 20 22.12 31.67 30.39 31.45 29.76 31.87
30 18.61 30.51 28.21 28.57 28.85 30.65
40 16.07 29.12 25.48 25.87 27.97 29.31
50 14.14 28.01 22.81 23.69 26.88 28.21
60 12.58 26.91 20.55 21.79 26.14 27.09
Panzer 20 22.12 25.17 26.72 26.78 23.47 26.81
30 18.61 24.91 26.11 26.38 22.04 26.39
40 16.08 24.71 24.25 24.61 21.24 25.86
50 14.14 24.51 22.19 22.84 20.64 25.29
60 12.57 24.31 20.19 21.26 20.1 24.73